diff options
Diffstat (limited to 'activerecord/lib/active_record/type/type_map.rb')
-rw-r--r-- | activerecord/lib/active_record/type/type_map.rb | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/activerecord/lib/active_record/type/type_map.rb b/activerecord/lib/active_record/type/type_map.rb new file mode 100644 index 0000000000..09f5ba6b74 --- /dev/null +++ b/activerecord/lib/active_record/type/type_map.rb @@ -0,0 +1,64 @@ +require 'thread_safe' + +module ActiveRecord + module Type + class TypeMap # :nodoc: + def initialize + @mapping = {} + @cache = ThreadSafe::Cache.new do |h, key| + h.fetch_or_store(key, ThreadSafe::Cache.new) + end + end + + def lookup(lookup_key, *args) + fetch(lookup_key, *args) { default_value } + end + + def fetch(lookup_key, *args, &block) + @cache[lookup_key].fetch_or_store(args) do + perform_fetch(lookup_key, *args, &block) + end + end + + def register_type(key, value = nil, &block) + raise ::ArgumentError unless value || block + @cache.clear + + if block + @mapping[key] = block + else + @mapping[key] = proc { value } + end + end + + def alias_type(key, target_key) + register_type(key) do |sql_type, *args| + metadata = sql_type[/\(.*\)/, 0] + lookup("#{target_key}#{metadata}", *args) + end + end + + def clear + @mapping.clear + end + + private + + def perform_fetch(lookup_key, *args) + matching_pair = @mapping.reverse_each.detect do |key, _| + key === lookup_key + end + + if matching_pair + matching_pair.last.call(lookup_key, *args) + else + yield lookup_key, *args + end + end + + def default_value + @default_value ||= Value.new + end + end + end +end |